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Description
It would be nice for all the functions to have in-depth explanations of what they do as per the lua reference manual.
https://www.lua.org/manual/5.4/manual.html#lua_pushnil
For example,
lua_pushnil
Pushes a nil value onto the stack.
[-0, +1, –]
http://luajit.org/running.html
https://www.lua.org/manual/5.1/manual.html
https://www.lua.org/manual/5.2/manual.html
https://www.lua.org/manual/5.3/manual.html
https://www.lua.org/manual/5.4/manual.html